The issue is that TfL and the Metropolitan Police both have campaigns about cyclists making sure they are visible, all the while TfL keeps designing infrastructure that forces cyclists to go up the lefthand side of vehicles, and advanced stop zones that are the exact same size and shape of the blind spot in front of HGV's.
Met Police 'Exchanging Places': https://youtu.be/UN7mJR64tvs
HGV blindspot training image: http://www.demotix.com/sites/default/files/imagecache/large_610x456_scaled/photos/253809.jpg
Advanced Stop Zone: http://4.bp.blogspot.com/-0P5bkEYlbMQ/UGGWo_ERyYI/AAAAAAAABUg/gQPjWycBEOg/s1600/2.JPG
As long as you have this massive disconnect, cyclists will continue to get killed.